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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_MAIL_AUTH 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_MAIL_AUTH \- SMTP authentication address
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_AUTH, char *auth);
+.SH DESCRIPTION
+Pass a pointer to a zero terminated string as parameter. This will be used to
+specify the authentication address (identity) of a submitted message that is
+being relayed to another server.
+
+This optional parameter allows co-operating agents in a trusted environment to
+communicate the authentication of individual messages and should only be used
+by the application program, using libcurl, if the application is itself a mail
+server acting in such an environment. If the application is operating as such
+and the AUTH address is not known or is invalid, then an empty string should
+be used for this parameter.
+
+Unlike \fICURLOPT_MAIL_FROM(3)\fP and \fICURLOPT_MAIL_RCPT(3)\fP, the address
+should not be specified within a pair of angled brackets (<>). However, if an
+empty string is used then a pair of brackets will be sent by libcurl as
+required by RFC2554.
+
+The application does not have to keep the string around after setting this
+option.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+SMTP
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "smtp://example.com/");
+  curl_easy_setopt(curl, CURLOPT_MAIL_AUTH, "<secret@cave>");
+  ret = curl_easy_perform(curl);
+  curl_easy_cleanup(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.25.0
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.
+.SH "SEE ALSO"
+.BR CURLOPT_MAIL_FROM "(3), " CURLOPT_MAIL_RCPT "(3), "